Here is the full list of all 27 Super Sanctum TD achievements.
Kill 10.000 Walkers.
Beat a level on Hard.
Clear the Facility Compound
Have no blocks at the end of a level.
Get 100 perfect rounds.
Kill a Big Walker.
Kill 2 enemies with a single Bomb.
Complete one level.
Clear the Training Area.
Beat a wave with only skills and blocks.
Complete a level without using any skills.
Hit 10 enemies with Thunderbolt.
Kill a Walker with an Anti Air Tower.
Kill 10 enemies in a single Penentrator shot.
Clear Brightholme Industries.
Clear the Hydro Islands.
Kill a Huge Walker.
Unlock all tower and skill slots.
Beat all levels on Normal.
Kill the Patriarch.
Kill the Charger and all its clones.
Unlock all towers and skills.
Beat all levels on Hard.
Kill the golden Walker.
Get all stars in all levels on Hard difficulty.
Kill 10 enemies with a single shot
Clear Elysion